Blowing-engine valve.



- PATBNTED 0013.16, 1906.

G. MBsTA. BLOWING ENGINE VALVE.

APPLIGATION FILED HAB.6, 1903.

2 SHEETS-SHEET 1.

WITN ESSES :Rs caA. WASHINGTON. D. c.

. h mvEn'roR No."833',473. lPATENTED OCT. y1651906.

G. MESTA.

BLOWING- ENGINE VALVE. APPLIGATION FILED MALB. 190e.

2 SHEETS-SHEET 2.

D wn'NEss-Es bmw UNITED sTATEs PATENT OFFICE.

GEORGE MESTA, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO ME-STA MACHINE COMPANY, A CORPORATION OF PENNSYLVANIA.

BLOWING-ENGINE VALVE.

Specicaton of Letters Patent.

Patented oct. 1e, 1906.

Application filed March 6, 1908. Serial No. 146.584.

Pittsburg, Allegheny county, Pennsylvania,

have invented a new and useful Blowing-Engine Valve, of which the following is a full, clear, and eXact description, reference being had to the accompanying drawings, forming part of this specification, in whichA Figure 1 is a sectional side elevation showing an outlet valve provided with my-improved actuating mechanism. Fig. 2 is a sectional to plan view at right angles to th at of Fig. 1. 4 an elevation, partly in section, IV IV of Fig. 2.

My invention relates to blowing-engine valve mechanism, and is designed to prevent pounding of the valve upon its seat, to cushon the line ion the valve movement in both.directions and to provide means for adjusting the cushioning action without stopping the operation of the engine or compressor, and to provide a stem which will visually show the movements of the valve in its stroke. It is also desi ed to prevent any leakage from the win -boX from affecting the operation of the valve, to prevent heatingof the valvemechanism, and to hold the valve-seat firmly in position and guide the valve.A In the drawings, 2 represents an outletvalve of a blowing-engine, having a stem 3 extending through a cushioning-cylinder 4, which is set within an inclosing chamber 5,

:preferably projecting into the Wind-box, the f outer cover of which-is shown at 6. Thei chamber 5 consists of a hollow casting with a projecting bearing 7 for the valve stem,

which is preferably provided with oil-grooves, f

\ to which. oilmay be supplied through a .pipe

leading to a hole 8.VV The stem 1s packed where it'. passes through. the headnof this chamber, preferably by metallic packing, .as indicated at9, .this being arranged toprevent air from leaking out around the rod or stem.

The cylinder 4 is secured to the chamber by radial arms 10, secured to the outer flange of the chamber, so that any air which'may leak from the wind-box into the chamber will pass out into the open air. The air circulation within this chamber also keeps the parts cool and prevents their becoming heated by the temperature of the compressed air forced into the wind-box. Within the cylinder 4 a piston 11 is secured to the valve-stem, and the ig. 3 is a rear elevation; and Fig.`

cylinder is provided with an inclined series of side holes 12 for exhaust, which are gradually closed by the piston in its movement..

As the iston nears the end of its travel in either direction it cuts 0H the last Vhole and then compresses the air to cushion the end of the valve movement. The air is gradually forced out through an outlet 13 in the inner head and an outlet 14 in the outer head, the area of each outlet beingl adjustable. For this purpose I show pipes aving petcocks 15. and connected to these outlets. To hold the valve-seat 16m lace and hold and guide the valve, I referab y employ an apertured cage 17 whic is preferably'integral with the seat and has an end ring 17 fitting against the end of the chamber 5. The inner diameter of the cage is a neat fit around the valve, and it acts as a guide for the valve when horizontal to prevent its drop ing. On aver-tical valve 1t acts to hold t e seat, and if .the

valve breaks off the stem it holds it from passing into the receiver.

The outer portion. 18 of the valve-stem is preferably reduced in diameterand moves through a screw-plug 19 in the outer end of a f hollow casin 20, having a rack by se menta 23, w 'ch is rocked by .suitable connection 21, engaged with the moving parts of the engine. l. Withv .85 24, having an enlarged inner end 25,:against.

in the inner end ofthetube V2.0 is a bushing which abuts the end of a spirals ring 26 the gear 22, secured to rock-shaftv othenend of which engagesthe `p ug 19.- The outerscrew-threadedhead-,27 ofthe bushing i i A 24 is ada ted to engage an adjustable ring 1 28,- held y lock-nut 29 on the valve-stem.

The tube `20 moves within a guiding-support 30, secured to a bracket 31, projecting outwardly from the head of the cushioning-cyl? inder, this bracket preferably being ofsemiy circular form.

In the operation of the device the valveis positively closed byl through the ktube andscrew-plug and thence through the spring and bushings.- As the valvelis forced to its seat the air-is forced out the rock-shaft -acting IOO of the cushioning-cylinder, the cushioning lated by the adjustable outlet. The piston in the cushioning-cylinder does not quite reach the end of its stroke as the valve seats. When the valve is seated, the rock-shaft is actuated to move the tube back along the Afaction at the end of the stroke beingreguments hereinafter claimed.

valve-stem extension, and When the pressure in the cylinders exceeds the Wind-box pressure the outlet-valve is forced open, thus forcing the piston llto the other end of its travel, the opening movement being cushioned by the adjustable outlet in its outer head. The stem is of such length that its end is visible and freely accessible in all positions of the parts, and I am thus enabled to see at all times Whether the valve is making its proper stroke. This feature will be appreciated by those skilled in the art.

- The advantages of my invention result from the peculiar combination which protects the cushioning-cylinder .and cools it by the air circulation, also from the improve- The chamber for the cushioning-cylindermay be outside the Wind-box. The valve mechanism may be used for hydraulic or other cylinders and may also be used for the inlet-valves of bloW- ing engines or compressors and many other variations may be made in the form and arrangement of the parts Without departing from' my invention.

I claiml. A blowing-engine having a Wind-box communicating with the receiver, a closed cooling-chamber projecting into the WindboX and open to the outer air, a cushioningcylinder projecting into the cooling-chamber and containing a piston, and an outlet-valve having its stem connected to the piston of the cushioning-chamber; substantially as described.

2. A blowing-engine having a closed chamber projecting into its outlet, and a valve having a cushioning-cylinder projecting into the chamber with openings to allow circulation of air in said chamber; an annular space being provided around the cushioning-cylinf der Within the closedchamber substantially as described.

3. A blowing-engine valve having a stem, a chamber surrounding said stem and open .to the air, and a cushioning-cylinder projectf 'ing into said chamber,

said stem passing through said cushioning-cylinder; substantially as described.

4. A blowing-engine valve having a stem, aV chamber surrounding lsaid stem and open to the air, a cushioning-cylinder projecting into said chamber, said stem passing through said cushioningcylinder, and actuating means intermediate the ends of said stem for closin the valve; substantially as described.

5. blowing-engine valve having a stem, a chamber surrounding said stem and open to the air, and a cushioning-cylinder projecting into said chamber and open at both ends to the air, said stem passing through said cushioning-cylinder; substantially as described.

6. A blowing-engine valve having a stem, a chamber surrounding said stem and open to the air, and a cushioning-cylinder projecting into said chamber and open to the air at a plurality of points intermediate the ends, said stem passing through said cushioningcylinder; substantially as described.

7. A blowing-engine valve having a stem, a chamber surrounding said stem and open to the air, a packing surrounding the valvestem at the inner head of the chamber, and a cushioning-cylinder projecting into said chamber, said stein passing through said cushioning-cylinder; substantially as described. l

8. A blowing-engine valve having a stem,

a chamber surrounding said stem and open to the air, a cushioning-cylinder projecting into saidchamber, said stem passing through said cushioning-cylinder, and mechanical connections acting upon the outer extension of the valve-stem and arranged to positively close the valve; substantially as described.

9. A blowing-engine having an outletvalve, an apertured cage around the valve arranged to hold the valve-seat in place, said cage having portions arranged to engage the outer surface of the valve-body and guide it, means for retaining the cage and seat in position, and connections for positively closing the valve substantially as described.

l0. A blowing-engine having an outletvalve, avalve-cage and guide divided into two chambers and located Within the WindboXr, one of the chambers forming a coolingchamber open to the outer air, a cushioningcylinder projecting into the latter chamber,

roo

and a piston secured on the valve-stem Withy in said cushioning-cylinder; substantiallyv as described.

l1. A blowing-engine having a wind-box, an outlet-valve therein, a cooling-chamber projecting into the wind-box, a guide surrounding the valve, said coolin `-chamber being open to the outer air, a cus iioning-cylinder projecting into the cooling-chamber and having holes opening thereinto, and a piston in the cushioning-cylinder secured to the valve-stem of the outlet-valve; substantially as described.

In testimony whereof I have hereunto set my hand.

`."GEoRGE MEsrA.

Witnesses GEO. B. BLEMING, H. M. CoRWIN.

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